Age and Composition of Zircons From the Devonian Petrivske Kimberlite Pipe of the Azov Domain, the Ukrainian Shield

Results of a study of U-Pb and Hf isotope systematics and trace element concentrations in five zircon crystals separated from the Devonian Petrivske kimberlite are reported in the paper. Four zircons have yielded Paleoproterozoic and Archean ages, while one zircon grain gave a Devonian age of 383.6±4.4 Ma (weighted mean 206Pb/238U age). The Precambrian zircons have been derived from terrigenous rocks of the Mykolaivka Suite that is cut by kimberlite, or directly from the Precambrian rock complexes that constitute continental crust in the East Azov. The Devonian zircon crystal has the U-Pb age that corresponds to the age of kimberlite emplacement. It is 14 m.y. younger than zircon megacrysts found in the Novolaspa kimberlite pipe in the same area. In addition, Petrivske zircon is richer in trace elements than its counterparts from the Novolaspa pipe. Petrivske and Novolaspa zircons crystallized from two different proto-kimberlite melts, whereas the process of kimberlite formation was very complex and possibly included several episodes of formation of proto-kimberlite melts, separated by extended (over 10 M.y.) periods of time.

Download Full-text

The retrograde hydration of the continental granitoid crust as seen from epidote-bearing veins: Trace elements and microstructures

10.5194/egusphere-egu2020-6785 ◽

2020 ◽

Author(s):

Veronica Peverelli ◽

Alfons Berger ◽

Thomas Pettke ◽

Holger Stunitz ◽

Pierre Lanari ◽

...

Keyword(s):

Trace Elements ◽

Trace Element ◽

Continental Crust ◽

Host Rock ◽

Geochemical Characteristics ◽

Geochemical Data ◽

Massif Central ◽

Eu Anomaly ◽

Aar Massif ◽

Ree Patterns

The widespread presence of epidote-bearing veins and hydrous minerals such as micas in meta-granitoid rocks attests to the large extent of hydration of the exhuming continental crust. The ability of epidote (Ca2Al3Si3O12(OH) &#8211; Ca2Al2Fe3+Si3O12(OH)) to incorporate a wide variety of trace elements renders this mineral a promising geochemical tracer of circulating fluid(s).We report trace element and microstructural data on epidote-bearing veins from the Aar Massif (Central Alps) and from the Albula Pass (Eastern Alps). We characterized and classified the epidote-bearing veins based on their extent of deformation, shape and size of the epidote grains, coexisting minerals, and degree of dynamic recrystallization of associated quartz. Laser ablation ICP-MS data of individual epidote crystals reveal prominent zoning, confirmed by electron probe maps for Sr and Mn. Overall, low to very low Th/U ratios (down to 0.0005 in the Aar Massif veins and 0.001 in the Albula ones) with Th often below limits of detection (< 0.1 &#181;g/g at 16 &#181;m beam size) go along with variably LREE-depleted patterns (and CI Chondrite-normalized LaN/YbN ~0.35 in the Aar Massif veins and ~0.60 in the Albula Pass veins). Strontium contents are variable (hundreds to thousands of &#181;g/g) and mostly high (up to 10100 &#181;g/g in the Aar Massif samples and 12800 &#181;g/g in the Albula Pass samples). The in-situ geochemical data are linked to the microstructures in order to assess whether microstructures can be related to variations in trace elements, also considering the role of coexisting phases. Moreover, trace element data of samples from the Aar Massif are compared to metamorphic host-rock epidotes and cleft epidotes from the same massif.We find that REE patterns of Aar Massif vein epidotes are clearly different than those of metamorphic host-rock epidotes and of cleft epidotes. In addition, REE patterns vary based on the microstructural characteristics of veins. Overall REE patterns of the Albula Pass vein epidotes resemble those from the Aar Massif. Different veins and microstructures define clusters in Sr vs. Y, Eu anomaly vs. Th/U ratios, and Eu anomaly vs. U values. Geochemical heterogeneities are observed among sampling localities within the Aar Massif.The fact that the geochemical characteristics of retrograde hydrothermal vein epidotes are clearly different than those of high-grade metamorphic and metamorphic host-rock epidotes, and the relationship between geochemical characteristics and microstructures support the hypothesis that the deformation did not alter the original geochemical record through neomineralization. Our data argue for the potential of epidote as a powerful fluid tracer in the granitoid continental crust.

Download Full-text

Trace Element and Stable Isotope Geochemistry of Lwamondo and Zebediela Kaolins, Limpopo Province, South Africa: Implication for Paleoenvironmental Reconstruction

Minerals ◽

10.3390/min9020093 ◽

2019 ◽

Vol 9 (2) ◽

pp. 93

Author(s):

Avhatakali Raphalalani ◽

Georges-Ivo Ekosse ◽

John Odiyo ◽

Jason Ogola ◽

Nenita Bukalo

Keyword(s):

Trace Elements ◽

Rare Earth ◽

Stable Isotope ◽

Trace Element ◽

Continental Crust ◽

Rare Earth Element ◽

Earth Element ◽

Paleoenvironmental Reconstruction ◽

Δ18o And Δd ◽

Ree Patterns

The aim of the present study was the paleoenvironmental reconstruction of the prevailing environment under which the Lwamondo and Zebediela kaolin deposits were formed. Hence, this study reports deuterium and oxygen stable isotope values and trace and rare earth element concentrations for two samples of kaolin. Upper continental crust-normalised trace-element patterns reveal that large ion lithophile elements and high-field-strength elements are generally depleted in Lwamondo and Zebediela kaolins, whereas transition trace elements are generally enriched in these kaolins. Upper continental crust-normalised rare earth element (REE) patterns show that there is a slight enrichment of heavy REEs (HREEs) compared to light REEs (LREEs) in these kaolins. The δ18O and δD stable isotope values for kaolinite from Lwamondo ranged from 17.4‰ to 19.1‰ and from −54‰ to 84‰, respectively, whereas those values for kaolinite from Zebediela varied from 15.6‰ to 17.7‰ and from −61‰ to –68‰ for δ18O and δD, respectively. The REE patterns and the content of other trace elements indicate ongoing kaolinitisation in the Lwamondo and Zebediela kaolins with minimum mineral sorting. The sources of the kaolins varied from basic to acidic and these were derived from an active margin tectonic setting. Lwamondo kaolin was deposited in an oxic environment whereas Zebediela kaolin was deposited under suboxic/anoxic conditions. Based on the δ18O and δD values of the kaolinite, they formed in a supergene environment at temperatures generally below 40 °C.

Download Full-text

Methylmercury and Trace Element Distribution in the Organs of Stenella coeruleoalba Dolphins Stranded on the French Mediterranean Coast

Open Environmental Sciences ◽

10.2174/1876325101408010035 ◽

2014 ◽

Vol 8 (1) ◽

pp. 35-48 ◽

Cited By ~ 3

Author(s):

Emmanuel Wafo ◽

Véronique Risoul ◽

Thérèse Schembri ◽

Véronique Lagadec ◽

Frank Dhermain ◽

...

Keyword(s):

Trace Elements ◽

Trace Element ◽

Marine Pollution ◽

Element Distribution ◽

Mediterranean Coast ◽

Trace Element Distribution ◽

Slight Reduction ◽

Stenella Coeruleoalba ◽

Contamination Levels

The main objective of this study was to evaluate the contamination by mercury (Hg), methylmercury (Me-Hg), cadmium (Cd), selenium (Se), zinc (Zn), copper (Cu), iron (Fe) and manganese (Mn) in dolphins stranded on the French Mediterranean coast. The distributions of these contaminants in the organs of dolphins have also been studied. Overall, contamination levels varied according to the following sequence: liver > kidney > lung > muscle, except for cadmium (kidney > liver > lung > muscle). Size and sex of animals were also considered. Young dolphins were less impacted with trace elements than adults, except for copper. Among the studied parameters, the most important appeared to be the size of mammals. In addition, in the case of mercury and selenium, the sex of mammals seemed to be also relevant. The correlations between the concentrations of trace elements suggest the existence of detoxification processes. Since 1990s, using dolphins for tracing marine pollution, a slight reduction in the burden of the considered trace elements could be noted.

Download Full-text

Spatial distribution and potential ecological risk assessment of some trace elements in sediments and grey mangrove (Avicennia marina) along the Arabian Gulf coast, Saudi Arabia

Open Chemistry ◽

10.1515/chem-2020-0010 ◽

2020 ◽

Vol 18 (1) ◽

pp. 77-96

Author(s):

Hameed Alsamadany ◽

Hassan S. Al-Zahrani ◽

El-Metwally M. Selim ◽

Mohsen M. El-Sherbiny

Keyword(s):

Trace Elements ◽

Trace Element ◽

Ecological Risk ◽

Oil Pollution ◽

Gulf Coast ◽

Arabian Gulf ◽

Avicennia Marina ◽

Potential Ecological Risk ◽

Average Concentration ◽

Grey Mangrove

AbstractTo assess trace element concentrations (Zn, Cu, Pb, Cr, Cd and Ni) in the mangrove swamps along the Saudi coast of the Arabian Gulf, thirteen samples of surface sediment and leaves of grey mangrove, Avicennia marina were collected and analyzed. The detected trace element contents (μg g-1) in surface sediments were in the following descending order according to their mean values; Cr (49.18) > Zn (48.48) > Cu (43.06) > Pb (26.61) > Ni (22.88) > Cd (3.21). The results showed that the average concentrations of Cd and Pb exceeded their world average concentration of shale. The geo-accumulation, potential ecological risk and toxicity response indices demonstrated that trace elements have posed a considerable ecological risk, especially Cd. The inter-relationships between physico-chemical characters and trace elements suggests that grained particles of mud represent a noteworthy character in the distribution of trace elements compared to organic materials. Moreover, the results revealed that Zn was clearly bioaccumulated in leaf tissues A. marina. Dredging, landfilling, sewage effluents and oil pollution can be the paramount sources of pollution in the area under investigation.

Download Full-text

Reliability of detrital marine sediments as proxy for continental crust composition: the effects of hydrodynamic sorting on Ti and Zr isotope systematics

Geochimica et Cosmochimica Acta ◽

10.1016/j.gca.2021.05.030 ◽

2021 ◽

Author(s):

Martijn Klaver ◽

Scott A. MacLennan ◽

Mauricio Ibañez-Mejia ◽

François L.H. Tissot ◽

Pieter Z. Vroon ◽

...

Keyword(s):

Continental Crust ◽

Marine Sediments ◽

Isotope Systematics

Download Full-text

Vitamin Analysis, Trace Elements Content, and Their Extractabilities in Tetrapleura tetraptera

Journal of Chemistry ◽

10.1155/2020/1608341 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8

Author(s):

Prince Oteng ◽

John K. Otchere ◽

Stephen Adusei ◽

Richard Q. Mensah ◽

Emmanuel Tei-Mensah

Keyword(s):

Trace Elements ◽

Vitamin A ◽

Vitamin C ◽

Trace Element ◽

Trace Element Content ◽

Beta Carotene ◽

Flame Atomic Absorption ◽

Significant Difference ◽

Tetrapleura Tetraptera ◽

Vitamin Analysis

Tetrapleura tetraptera is widely cherished in African traditional homes because of its alleged therapeutic and nutritional properties. This present study aimed at determining the levels of vitamin A, C, E, and beta-carotene and trace element (Fe, Cu, Mn, Co, Se, and Zn) concentrations and their extractabilities in the pulp, seeds, and whole fruit (mixture of pulp and seeds) of T. tetraptera. The total trace element concentration of Fe, Cu, Co, Mn, and Zn and their extractabilities (%) were determined using flame atomic absorption spectrometer (FAAS), whereas UV-VIS spectrophotometer was used to determine selenium concentration. The trace element content (mg/kg) based on dry weight in the pulp, seeds, and whole fruit was Fe (162.00 ± 7.14, 115.00 ± 12.00, and 154.00 ± 25.20, respectively), Zn (31.60 ± 4.77, 43.40 ± 5.29, and 41.50 ± 8.97, respectively), Cu (16.10 ± 4.98, 11.90 ± 8.40, and 17.20 ± 14.50, respectively), Mn (55.30 ± 2.41, 156.00 ± 10.20, and 122.00 ± 5.29, respectively), Co (38.10 ± 6.40, 21.10 ± 7.15, and 44.00 ± 14.90, respectively), and Se (1.49 ± 0.17, 2.43 ± 0.28, and 2.97 ± 0.27 μg/g, respectively). The mineral extractabilities (%) in the pulp, seeds, and whole fruit of T. tetraptera were established to be in the order Co > Zn > Fe > Cu > Se > Mn. Also, the chromatographic method (HPLC) was used to evaluate vitamin E concentration, and vitamin C and concentration of beta-carotene were calculated from the obtained concentration of vitamin A using a conversion factor by the titrimetric method. From the results of vitamin analysis, a significant difference (p<0.05) was observed among the pulp, seeds, and whole fruit for vitamin C and E. However, no significant difference (p>0.05) was perceived among these plant parts for vitamin A and beta-carotene. This study has therefore revealed that the pulp, seeds, and whole fruit of T. tetraptera contain varying concentrations of vitamins and trace elements and has given many vital insights on which part of T. tetraptera to consume, as concentrations of these nutrients differ in the discrete parts of the fruit.

Download Full-text

Comparative Genomics of Trace Element Dependence in Biology

Journal of Biological Chemistry ◽

10.1074/jbc.r110.172833 ◽

2011 ◽

Vol 286 (27) ◽

pp. 23623-23629 ◽

Cited By ~ 36

Author(s):

Yan Zhang ◽

Vadim N. Gladyshev

Keyword(s):

Trace Elements ◽

Comparative Genomics ◽

Trace Element ◽

Evolutionary Dynamics ◽

Protein Families ◽

Fundamental Properties ◽

Recent Advances ◽

Living Organisms ◽

Zinc Protein

Biological trace elements are needed in small quantities but are used by all living organisms. A growing list of trace element-dependent proteins and trace element utilization pathways highlights the importance of these elements for life. In this minireview, we focus on recent advances in comparative genomics of trace elements and explore the evolutionary dynamics of the dependence of user proteins on these elements. Many zinc protein families evolved representatives that lack this metal, whereas selenocysteine in proteins is dynamically exchanged with cysteine. Several other elements, such as molybdenum and nickel, have a limited number of user protein families, but they are strictly dependent on these metals. Comparative genomics of trace elements provides a foundation for investigating the fundamental properties, functions, and evolutionary dynamics of trace element dependence in biology.

Download Full-text

Study of Aquatic Insect, Caddisfly, Stenopsyche marmorata as Bio-monitor of Trace Element Contamination in Rivers and Streams: Accumulation of Waterborne Trace Elements under Laboratory Conditions.

Journal of Japan Society on Water Environment ◽

10.2965/jswe.18.917 ◽

1995 ◽

Vol 18 (11) ◽

pp. 917-923 ◽

Cited By ~ 4

Author(s):

Hiroshi TOCHIMOTO ◽

Taichiro NISHIMA

Keyword(s):

Trace Elements ◽

Trace Element ◽

Aquatic Insect ◽

Laboratory Conditions ◽

Rivers And Streams ◽

Trace Element Contamination

Download Full-text

Solid/liquid partition coefficients to model trace element critical loads for agricultural soils in Canada

Canadian Journal of Soil Science ◽

10.4141/s06-061 ◽

2007 ◽

Vol 87 (Special Issue) ◽

pp. 189-201 ◽

Cited By ~ 20

Author(s):

M I Sheppard ◽

S C Sheppard ◽

C A Grant

Keyword(s):

Trace Elements ◽

Trace Element ◽

Best Management Practices ◽

Management Practices ◽

Agricultural Land ◽

National Level ◽

Trace Element Content ◽

Crop Productivity ◽

Multiple Sources ◽

Solid Liquid

Canadian consumers are demanding a sustainable agricultural industry as well as products delivered under Best Management Practices (BMPs). Trace element accumulation in soils may influence crop productivity, food quality and ecosystem and human health. Canada’s feed and foodstuff export industry has already faced cases of penalties for high trace element content [cadmium (Cd) in durum wheat]. Thus, it is imperative to be able to estimate the accumulation and potential short- and long-term impacts of trace elements in soil. A national-level Trace Element Indicator (TEI) based on present loadings of trace elements to agricultural land is in progress. An Expert Panel including Canadian, American and Australian experts guided the assembly of a proposed methodology for this TEI. The proposed TEI, described briefly here, is a critical load approach with a single expression of the risk of impact from single or multiple trace elements from multiple sources (manures, biosolids, effluents and fertilizers and natural processes), invoked in a stochastic manner. Two key data requirements are the current background levels of trace elements in soil, and the leachability of these trace elements. A survey of total and soluble concentrations of 54 elements in up to 112 soils was completed. Although preliminary in scope, these represent key soil series in Canada. From this, a database of the solid/liquid partition coefficient, Kd, was computed. These Kd values will be used to characterize the leachability of the trace elements. Key words: Cadmium, copper, zinc, lead, nickel, uranium, metals, Kd, distribution coefficient

Download Full-text